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Reports single character strings being used as an argument in <code>String.indexOf()</code> and
<code>String.lastIndexOf()</code> calls.
<p>A quick-fix is suggested to replace such string literals with equivalent character literals, gaining some performance enhancement.</p>
<p><b>Example:</b></p>
<pre><code>
  return s.indexOf("x");
</code></pre>
<p>After the quick-fix is applied:</p>
<pre><code>
  return s.indexOf('x');
</code></pre>
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